Current state of orange juice industry
The orange juice industry is at a crossroads, as sales
have dropped almost every year for the last decade. In
2014, according to Nielsen data, orange juice sales hit
their lowest level in at least 20 years. Over the same
period, per-capita consumption fell roughly 40%. And the
immediate future looks challenging for producers.
The swift decline of orange juice sales is indeed
having a significant impact on the producers of orange
juice made from concentrate. For most of the late 20th
Century, orange juice was a breakfast staple, as approxi-
mately three quarters of all U.S. households consistently
drank it. But a combination of shifting breakfast habits
of Americans, who each year continue to eschew sugar,
and the steady, upward climb of juice prices in general,
in large part caused by climate – and in the case of
Florida, an insect-born disease – has had a powerful,
adverse effect on demand.
Thus, with fewer productive trees, the price of growing
oranges is on the rise. According to Florida Citrus
estimates, the cost of growing orange trees has doubled
from roughly $1,500 an acre in 2000 to as much as
$3,000 today, and the cost is increasing year by year. As
U.S. supplies continue to decrease – according to some
estimates, yearly production could actually fall below 100
million boxes over the next five years – prices will most
likely continue their upward climb. And the wholesale
price of orange juice has doubled over the past decade
and a half, which in turn, is passed on to the consumer.
While imports of oranges to the U.S. are up slightly,
they have yet to make an impact on the decline in U.S.
production. For instance, Brazil, which accounts for
nearly all of the world’s consumption of oranges outside
of the U.S., has been beset by its own market and
production challenges.
Source: U.S. Bureau of Labor
Consumer Price of Orange Juice – 2005-2015
Helping Producers’ Profitability
Refractometers’ role in concentrate
So, given that the environment of increasing commodity
prices is putting a drag on the industry’s collective
bottom line, fruit juice producers, trying to find ways to
increase profitability, are searching for the latest
technologies for effective processes for °Brix analysis.
For well over two decades, manufacturers, for their
primary instrument in measuring the final dilution ratio
– or °Brix – for reconstituted juice, have utilized flow
meters, density meters and refractometers. These have
served to both ensure optimum quality, as well as reduce
losses through the stringent control of the yields from
orange juice made from concentrate.
The most successful to date has been the refractometer.
As a discipline, refractometry is an inexpensive
technique designed to deliver rapid and consistent
measurements of the fully dissolved solid content of any
liquid sample. Over the past several years, in an effort
to accurately measure °Brix, and to lessen losses by
ensuring that they have full control over yields of
concentrate, the vast majority of beverage
manufacturers have been employing digital refractometers.
In addition to quality control, consistent confirmation and
corroboration of laboratory instrumentation is paramount
in today’s manufacturing facilities as an assurance of
overall efficiency – which, at the end of the day, directly
impacts the balance sheet.
However, since the digital automatic refractometer came
on the market about 35 years ago, there have been issues
associated with discrepancies between measurements
obtained using these instruments and traditional refrac-
tometers when dealing with non-homogenous, pulp-filled
orange juice. Primarily because of the inconsistencies
some samples may contain, refractive index (RI)
readings measured on orange juice samples by modern
electronic refractometers are at times misleading.
Challenges in achieving high accuracy
°Brix measurements
The accuracy of measurement techniques afforded by
today’s digital refractometers have exposed a potentially
costly, unstable attribute within an orange juice sample
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°B
rix
Application
Typical Refractometer
Orange Juice °Brix Readings Repeatability on Conventional Digital Refractometer
that has a direct impact on dilution control. As orange
juice is a function food – in this case health-promoting and
disease preventing – firm quality control is essential. Thus,
the questionable sample may be hampering the ability to
reduce costs by decreasing target values without the risk of
not meeting even minimum regulatory requirements.
The difference between instrument, sample and
ambient temperatures cause an unpredictable stabilization
period between the analyses of samples, thus compounding
the effects of the settling of solid particles onto the surface of
the prism as being the root cause.
Because orange juice made from concentrate
measurement repeatability can be erratic, packers must
operate at a higher dilution ratio. Thus, if the packer
is unaware that the lower limit is being breached, and
the product is then delivered to the retailer which then
determines the product is not to its specifications, the
packer may indeed lose a valuable contract.
Resolution: °Brix 0.01
Accuracy: °Brix ±0.01 (0 – 20 °Brix)
±0.03 (20 – 100 °Brix)
Reproducibility: °Brix ±0.01 for sucrose solutions
±0.02 for orange juice
Modes Conventional & Pro-Juice
Reading Time 4-180 seconds (Method/
stability dependent)
Methods Multiple methods with citric
acid correction and offset
Presser Type Polyacetal XyCone flow
through cell with leur taper
inlet for attachment of
stainless steel funnel for rapid
changeover between samples
or none (lifted) for
conventional operation
Measuring Temperature
Range
0°C or 10°C below ambient
whichever is the greater to
70°C
Temperature Sensor
Accuracy
± 0.03°C
Sample Temperature
Stability
± 0.05°C
Temperature Stability
Checks
None/delay time/repeatability/
Smart/Pro-Juice
Prism Artificial Sapphire
12mm sample area diameter
Prism Dish 316 Stainless Steel / PEEK
Prism Seal Silicon/Resin
Interfaces 1 Parallel (printer), 2 x Serial
(RS232)
Sample
Illumination
Light Emitting Diode (life
100,000hr +) 589nm
Temperature
Control
Peltier (sensor and sample
conditioner)
Power Supply External 100-240V, 50-60Hz,
6A. Supplied with instrument
Physical Specifications
Specifications
In order to achieve high accuracy results for
orange juice samples like other fruit juices – and
to mitigate the problems with many refractometers
currently being marketed, Bellingham + Stanley,
a unit of Xylem’s analytics businesses, has
developed an instrument that is based on its
proven RFM340+ refractometer – one that
provides a measurement with 0.01 °Brix accuracy
for sucrose solutions and 0.02 °Brix reproducibility
between orange juice samples, irrespective of the
temperature differential or the skill level of
the operator.
Bellingham + Stanley’s
Pro-Juice Solution
The device – the Pro-Juice refractometer – takes care of
all of the typical issues of refractometric analysis of orange
juice measurement through the combination of dynamic
measurement and intelligent thermal conditioning.
Among its many other benefits that are designed to
provide superior analysis and improved productivity
include:
• Using a peristaltic pump to prevent the settling
of the solid particles onto the prism surface by
keeping the sample in constant motion and
delivering it for measurement at precisely the right
temperature, thus eliminating stabilization time and
ensuring that no detrimental settling occurs on the
prism surface.
• Its on-screen menu helps the operator in every
stage of measurement and the built-in software
ensures cleanliness, which is essential to achieve
a high accuracy result and helps to eliminate staff
training, especially where there is a relatively high
through-put of non-skilled operators.
• Pro-Juice has been designed to deliver °Brix
analysis within 2.5 minutes that includes sample
preparation and cleaning cycle, thus reducing
downtime irrespective of the temperature differ-
ence between the instrument and sample.
• The cleverly shaped XyCone flow cell enables
sample readings in constant motion and its vortex
technology ensures samples are properly flushed
between applications. Further, its easy release
arm facilitates calibration, measurement and
end-of-day cleaning.
• To enable routine maintenance, an externally
mounted peristaltic pump facilitates rapid tube
exchange; air filters protecting the solid state heat
exchangers can be changed in seconds.
The outstanding repeatability provided by the
Pro-Juice refractometer can be illustrated through taking
multiple readings of an orange juice sample in the
Pro-Juice, on a refractometer under factory conditions,
and on a high specification digital refractometer under
ideal conditions. The Pro-Juice refractometer resolves
all issues related to the orange juice measurement on a
standard refractometer. Using the Pro-Juice refractometer,
orange juice manufacturers can produce orange juice
from concentrate with acceptance tolerances as low as
possible, thus making significant savings and a quick
return on initial investments.
Further, the Pro-Juice is not exclusively designed for orange
juice analysis. Its software, using the METHODS system,
which together with the quick release soft flow cell, facilitates
conventional “single shot measurement” of any sample up
to 95 °Brix in a matter of seconds, so that other diluted juices
and concentrates can be measured.
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rix
Application
Typical Refractometer Pro-Juice
Orange Juice °Brix Readings Comparison
of Repeatability
Conventional vs. Pro-Juice Refractometer
0
10
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40
50
60
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-0.15 -0.10 -0.05 0.00 0.05 0.10 0.15
Pr
ob
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ty
D
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°Brix Offset from Average Reading
Standard Refractometer Pro-Juice in B+S Lab Pro-Juice by Customer
Orange juice reading distribution comparison –
Conventional vs. Pro-Juice Refractometer, showing excellent
repeatability between client and instrument manufacturer using
the Pro-Juice refractometer
In a competitive market where constantly increasing
commodity prices are putting a pressure on profitability,
fruit juice producers need to look to the latest technology
to ensure that the most effective processes for °Brix
analysis are in place.
The Pro-Juice will not only prove a viable method to
help reduce costs by tightly controlling product yield
for all fruit juice types, including orange juice with or
without added pulp, it will do so without putting lucrative
contracts at risk.
In summary
The orange juice industry is arguably in its most
challenging era ever. Higher commodity prices, caused by
lower yields and decreasing consumption among
consumers, have the industry feverishly seeking for ways
to increase profitability. One tested method that can
enable manufacturers to improve production – to refine
blend ratios to an extent that losses are significantly
reduced – is a refractometer that has time and again
delivered positive results: the Bellingham + Stanley
Pro-Juice.
About Bellingham + Stanley
For 100 years, Bellingham + Stanley has been one of
the world’s leading manufacturers of Refractometers
and Polarimeters. Instrumentation is supplied to over 80
countries around the World and many global companies
consider our products as the ultimate in quality and
performance.
The company’s expertise in optical engineering,
electronics and software design has enabled Bellingham
+ Stanley to create instruments that are used extensively
throughout the world’s food, drinks, pharmaceutical,
chemical and petroleum industries.
For more information about the Pro-Juice
refractometer and other Bellingham + Stanley products,
please visit www.bellinghamandstanley.com.
About Xylem Analytics
Xylem’s analytics businesses are leading manufacturers
of premium field, portable, laboratory and online
analytical instruments used in water and wastewater,
environmental, food and beverage, pharmaceutical and
life science applications. The company’s meters, sensors,
analyzers and related consumables are used every day
by thousands of end-users worldwide to analyze and
control quality in countless applications where precise
measurement is required. Xylem Analytics started with
the core brands of WTW, SI Analytics, Aanderaa Data
Instruments, Global Water Instrumentation, ebro and
Bellingham + Stanley, and has grown through a series of
successful acquisitions including OI Analytical, YSI and
MJK Automation.
www.xylemanalytics.com
About Xylem
Xylem (XYL) is a leading global water technology
provider, enabling customers to transport, treat, test
and efficiently use water in public utility, residential and
commercial building services, industrial and agricultural
settings. The company does business in more than
150 countries through a number of market-leading
product brands, and its people bring broad applications
expertise with a strong focus on finding local solutions
to the world’s most challenging water and wastewater
problems. Xylem is headquartered in Rye Brook, N.Y.,
with 2014 revenues of $3.9 billion and more than 12,500
employees worldwide. Xylem was named to the Dow
Jones Sustainability World Index for the last three
years for advancing sustainable business practices and
solutions worldwide.
The name Xylem is derived from classical Greek and
is the tissue that transports water in plants, highlighting
the engineering efficiency of our water-centric business
by linking it with the best water transportation of all
— that which occurs in nature. For more information,
please visit us at www.xyleminc.com.
Refractometers’ Role in Concentrate – Helping Producers’ Profitability
Refractometers are used to continuously monitor the concentrations of liquids used in the food and beverage, chemical, energy, and metalworking industries, among others. Download this research study to learn how to your reduce costs by tightly controlling product yield.